pybind11: remove py::overload_cast in favor of c-style cast
pybind11: remove py::overload_cast in favor of c-style cast

this is a workaround for clang for the following problem:
https://github.com/pybind/pybind11/issues/1153

toxa81/sirius,electronic-structure/sirius,electronic-structure/sirius,electronic-structure/sirius,electronic-structure/sirius,electronic-structure/sirius,electronic-structure/sirius,toxa81/sirius,toxa81/sirius,toxa81/sirius,toxa81/sirius,toxa81/sirius,electronic-structure/sirius